/Engine/Source/Editor/BlueprintEditorLibrary/Public/BlueprintEditorLibrary.h
Gathers any unused blueprint variables and populates the given array of FPropertys
True if variables were checked on this blueprint, false otherwise.
static bool GatherUnusedVariables ( const [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [TArray](API\Runtime\Core\Containers\TArray)< [FProperty](API\Runtime\CoreUObject\UObject\FProperty) * > & OutProperties )